Pulp-screen.



PATENTED NOV. 15, 1904.

H. J. DIGKERSON.

PULP SCREEN. APPLIOATIOE FILED JULY 30. 1903.

N0 MODEL.

PATENTED NOV. 15, 1904.

H. J. DICKERSON.

PULP SCREEN. APPLICATION FILED JULY 30 1903.

NO MODEL.

2 SHEETS-SHEET 2.

NRY J Dun/555 WITNEEEEE umwzcm L113 Kud/ mmaw HTTUHNEY UNITED STATESPatented November 15, 1904.

PATENT OFFICE.

PULP-SCREEN.

SPECIFICATION forming part of Letters Patent No. 774,966,

dated November 15, 1904.

Application filed m 90,1903. serial No. 167,608. (NomodeL) To all whomit may concern.-

Be it known that I, HENRYJ. DICKERSON, a citizen of theUnitedStates,residing at Niagara Falls, in the county of Niagara and State ofNew York, have invented certain new and useful Improvements inPulp-Screens; and I do hereby declare the followingto be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanyingdrawings,

and to figures of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in pulp-screens, and moreparticularly to that class of construction for which Letters Patent No.585,656 were granted to me on the 6th day of July. 1897. The basis ofsuch construction was a pulp-screen consisting of a frame provided withlongitudinal cleats, transverse movable supports resting upon saidcleats, dovetail plates secured to said movable supports, corrugatedplates engaging with said dovetails, and set-screws threaded throughsaid frame and forcing all of said movable supports and plates to placeupon the line of said corrugation simultaneously, for the purpose setforth.

The objects of my present invention are, first, to provide an all-metalvat and screenplate frame for the sake of increased rigidity anddurability, and, second, to provide anovel and improved arrangement andconstruction of parts whereby the insertion and removal of thescreen-plates in and from their frame are greatly facilitated.

To these ends my invention consists of a certain arrangement andcombination of parts, all of which will be fully hereinafter describedand claimed.

In the drawings, Figure 1 is a top plan view of my improved vatcomplete. Fig. 2 is a similar view with the hinged side walls of the vatremoved. Fig. 3 is a vertical section taken in the line 00 m of Fig. 1.Fig. 4 is a rear elevation. Fig. 5 is a vertical longitudinal section ofthe vat with the screen-plates removed. Fig. 6 shows two forms ofscreenplates in transverse section. Fig. 7 is afragmentary end inperspective of one of the tightening-plates. Fig. 8 is a perspectiveview of one of the movable supports for the screen-plates. Fig. 9 is aperspective view of one of the sliding holders for the movable supports.Fig. 10 is a perspective view of a fragmentary end of one of the movablesupports seated in its sliding holders, and Fig. 11 is a perspectiveview of one of the uniform parts of a sectional screen.

Referring to the drawings, it will be seen that the four sides 1 of theupper frame of the pulp-vat, forming the upper walls thereof, are formedof channel-iron or its equivalent, which permits of the upper flanges 2and the lower flanges 3. A non-corrosive lining 4:, preferably ofcopper, extends over the top flanges 2, the inner vertical face of thechannel-iron, and under the lower flanges 3, as clearly shown in Fig. 3.The lower screenplate frame is similarly formed of channeliron 5. whichis similarly covered with acopper lining 6. The upper frame is hinged at7 7 to the lower frame, and when closed a packing 8 (see Fig. 3) isinterposed between the flanges 3 of the upper channel-iron and theflange 9 of the lower channel-iron and compressed by the clamps 10, (seeFig. 4,) which forms a tight joint.

7 Along the lower inside edges of two opposite walls of the screen-plateframe are secured the holding-up side ledges 11 11, which are inclosedwithin the continuous copper lining 6, as clearly shown in Fig. 3. Itwill also be seen (see Fig. 3) that the sides of the upper frame extendoutwardly a short distance beyond the sides of the lower frame, thusforming a holding-down shoulder for the screenplates. which, acting inconjunction with the holding-up ledges 11 11, serve to form a tightreceptacle for the ends of the screen-plates.

12 12 are the end tightening-plates, having their inner edges providedwith the angular grooves 13. (See Fig. 7.) The ends of thesetightening-plates 12 have the extensions 1 1 14, provided with sockets15. Registering sockets 16 16 are secured to the lower frame. Throughthese registering sockets are passed the screw-bolts 17, which with thenuts 18 serve to force the tightening-plates 12 into operative position.

IOO

19 represents the movable supports, the ends of which rest upon the sideledges 11 11. These supports are made reversible by having the upper setof opposite angular grooves 20 20 and the lower set 21 21. (See Fig. 8.)

Sliding holders are provided for the ends of the movable carriers, whichconsist of the back 22. (see Fig. 9,) the two vertical parallel walls 2323 forming a socket for the reception of the end of the movable support19, and. the beveled side wings 24L 2 1. These supports slide along theledges 11 11 and serve to hold the movable supports 19 in operativeposition. I have shown in the drawings two forms of screen-plates, ofwhich 25 is the style of corrugated plate shown and claimed in my patenthereinbefore mentioned. The other form, which is an improvement, isshown at 26, and consists of a metal plate 27, (see Fig. 6,) having onits under side a series of spaced inverted-V-shaped grooves 28,extending nearly through the plate, and spaced transverse slots 29, cutthrough the plate at the apexes of the grooves 28.

In Fig. 11 I have shown a single bar of a sectional form of screw-plate,which is presented in its entirety at in Fig. 2. This bar has a flatrectangular upper face 31, its ends being provided withoppositely-placed side lugs 32 32, the side walls of the bars havingincluded converging faces 33 33. A series of these bars when assembledform practically the style of screen-plates shown at 26, with theadditional advantage that when a portion of the sectional platebecomesinoperative one or more of the bars may be renewed, the balanceremaining, while in the case of the form shown at 26 the entire platemust necessarily be renewed.

The side edges of all of the screen-plates are beveled, as shown at 34,Fig. 5, to enable them to have holdingengagement with the grooves 13 inthe tightening-plates 12 and the grooves 20 and 21 in the movablesupports 19.

In assembling the parts for operation the screen-plates are placed inengagement with the upper grooves of the intermediate movable supportsand the grooves of the end tightening-plates, and by turning the nuts 18a practically rigid screen is formed the entire length of the frame. Theend screw-braces 35 35, which pass through the walls of the lower frameand the intermediate brace 36, engage in the lower grooves 21 21 of theintermediate movable supports 19 and serve to increase the structuralrigidity of the screenplates.

By means of the all-metal construction of the pulpvat, which constitutesa most importantfeature of my invention, the screen-plates are providedwith a lirmer foundation than the wood of the old form of vat, which isspringy and yielding. Consequently the screenplates will yield much lessto the suction of the screen in the all-metal construction.

too, the wood in the old form of vat is constantly rotting and stainingthe product in its passage therethrough, while in my improved all-metalconstruction, which is practically indestructible, the deterioration ofthe product is entirely avoided, and there is nothing present to stainthe most delicate tints of paper. The solidity of construction,the-plates being held as in an iron vise, eliminates a large percentageof the vibration which obtains with the old wood construction, whichtends to greater efliciency in the working of the screen.

My improved construction and arrangement permits of easy and rapidmanipulation in assembling the parts for operation, as well as indismantling for the purpose of renewing any of the parts when necessary.

\Vhere the channel-iron which forms the side walls of the vat comestogether, forming joints, I-prefer to bolt or rivet thereto pieces ofangle-iron, with packing interposed to form water-tight joints.

I claim- 1. A metal pulp-vat in which the screenplates are removablysecured. the inner walls of which are covered with a non-corrosive metallining, as and for the purpose stated.

2. A pulp-vat comprising a lower flanged metal frame in which thescreen-plates are removabl y secured,an upper flanged metal frameforming the upper walls of the vat and hinged to the lower frame, theinner walls of the two frames being covered with a non-corrosive metallining, a packing between the abutting flanges of the two frames, and aseries of clamps for tightening the abutting flanges against theinterposed packing to form a tight joint, as and for the purpose stated.

3. In a pulp-vat, the combination with the screen-plate frame havingside ledges, the end grooved tightening-plates and the intermediatemovable supports grooved at top and bottom and resting upon the sideledges of the frame, of the removable screen-plates having beveled sideedges adapted to fit within the grooves of the end tightening-plates andthe upper grooves of the intermediate movable supports, and the endscrew-braces adapted for engagement with the lower grooves of theintermediate movable supports, as and for the purpose stated.

a. In a pulp-vat, the combination with the screen-plate frame havingside ledges, the end grooved tightening-plates the intermediate movablesupports grooved at top and bottom and resting upon the side ledges ofthe frame,

and the sliding holders for the ends of the intermediate groovedsupports, of the removable screen-plates having beveled side edgesadapted to fit Within the grooves of the end tightening-plates and theupper grooves of the intermediate braces adapted for engagement with thelower grooves of the intermediate movable supports, as and for the pur-Then, l pose stated.

5. In a pulp-vat,the reversible movable supports for the screen-plates,such supports being provided at top and bottom with oppositelongitudinal grooves, as and for the purpose stated.

6. In a pulp-vat,'the combination with the reversible movable supportsfor the screenplates, such supports being provided at top and bottomwith opposite longitudinal grooves of the sliding holders for the endsof the movable supports, as and for the purpose stated.

7. A pulp-vat comprising a lower flanged metal frame provided withholding-up side ledges, on which the screen-plates rest, and an upperflanged metal frame forming the side walls of the vat, such side wallsextending inwardly a short distance beyond the sides of the lower frame,forming a holding-down shoulder, between which and the holding-up sideledges, the screen-plates are secured, as and for the purpose stated.

8. A pulp-vat comprising a lower flanged metal frame provided withholding-up side ledges, on which the screen-plates rest, and an upperflanged metal frame hinged to the lower frame and forming the side wallsof the vat, such walls extendinginwardly a short distance beyond thesides of the lower frame, forming a holding-down shoulder, between whichand the holdingup side ledges, the sereen-plates are secured, as and forthe purpose stated.

9. In a pulp vat the combination with a lower flanged metal frameprovided with holding-up side ledges on which the screen-plates rest,and an upper flanged metal frame forming the side walls of the vat, suchwalls extending inwardly a short distance beyond the sides of the lowerframe, forming a holdingdown shoulder, between which and the holding-upside ledges, the screen-plates are secured, of the end groovedtightening-plates, the intermediate grooved movable supports restingupon the holding-up side ledges, the removable screen-plates adapted tofltwithin the grooves of the end tightening-plates, and the intermediatemovable supports, as and for the purpose stated.

10. In a pulp-vat the combination with a lower flanged metal frameprovided with holding-up side ledges on which the screen-plates rest,and an upper flanged metal framehinged to the lower frame and formingthe side walls of the vat, such walls extending inwardly a shortdistance beyond the sides of the lower frame, forming a holding-downshoulder, between which and the holding-up side ledges the screen-platesare secured, of the end grooved tightening-plates, the intermediategrooved movable supports resting upon the holding-up side ledges, thesliding holders for the ends of the intermediate grooved movablesupports, the removable screen-plates having beveled side edges adaptedto fit within the grooves of the end tightening-plates, and theintermediate movable supports, as and for the purpose stated.

In testimony whereof I have signed my'name to this specificati on in thepresence of two subscribing witnesses.

HENRY J. DICKERSON. Witnesses:

C. B. BUTLER, W. 'I. MILLER.

